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Apparatus and method for processing LLR for error correction code in a mobile communication system

probability ratio technology, applied in the field of log likelihood ratio (llr) processing apparatus and method in a mobile communication system, can solve the problems of system performance degradation, mismatch between llrs and quantization levels, etc., and achieve the effect of efficient scaling of llrs

Inactive Publication Date: 2007-04-19
SAMSUNG ELECTRONICS CO LTD
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  • Abstract
  • Description
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Benefits of technology

[0011] An object of embodiments of the present invention is to substantially solve at least the above problems and / or disadvantages and to provide at least the advantages described below. Accordingly, an object of embodiments of the present invention is to provide an apparatus and method for efficiently scaling LLRs to support a variety of modulation levels and code rates according to changes of a radio channel in a mobile communication system.
[0012] Another object of embodiments of the present invention is to provide an apparatus and method for efficiently scaling LLRs by changing the mean of scaled LLRs according to a radio channel environment in a mobile communication system.
[0013] A further object of embodiments of the present invention is to provide an apparatus and method for scaling LLRs which vary highly with changes of a radio channel, to quantization levels suitable for a quantizer in a mobile communication system.

Problems solved by technology

However, if the mean of the scaled LLRs is constant, LLRs fluctuate significantly, leading to mismatch between the LLRs and quantization levels in a system supporting a variety of modulation levels and code rates under a Multiple-Input Multiple-Output (MIMO) environment or a fading channel environment.
As a consequence, system performance is degraded.

Method used

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  • Apparatus and method for processing LLR for error correction code in a mobile communication system

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Embodiment Construction

[0026] Exemplary embodiments of the present invention will be described herein below with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

[0027] The present invention is intended to provide an LLR processing technique that is applicable to a mobile communication system supporting a variety of channel environments. While the following description is made in the context of a Multiple-Input Multiple-Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) wireless communication system, it is to be understood that embodiments of the present invention are also applicable to any wireless communication system as far as it uses an LLR-based channel decoder. Preferably, LLR scaling is performed on an FEC code block basis, however embodiments of the present invention are not limited thereto. Thus, the LLR scaling can be done on any other pr...

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Abstract

An apparatus and method for scaling an LLR for an error correction code in a mobile communication system are provided. In the LLR scaling apparatus, an environment factor controller decides an environment factor according to a radio channel environment. A scaling factor generator generates a scaling factor using the environment factor and a received LLR. A multiplier then multiplies the LLR by the scaling factor to scale the LLR.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit under 35 U.S.C. §119(a) of Korean Patent Application No. 10-2005-0097848, filed in the Korean Intellectual Property Office on Oct. 18, 2005, the entire disclosure of which is incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates generally to a Log Likelihood Ratio (LLR) processing apparatus and method in a mobile communication system. In particular, the present invention relates to an apparatus and method for efficiently scaling LLR values input to a Forward Error Correction (FEC) decoder according to channel environment or system performance in a mobile communication system. [0004] 2. Description of the Related Art [0005] In a mobile communication system, a decoder performs soft decision decoding to correct errors of a received signal. Specifically, the decoder generates soft decision values corresponding to channel-encoded...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04L1/02
CPCH03M13/45H03M13/6577H03M13/658H04L1/0045H04L1/06H04L25/067H04L27/2647H04B7/005
Inventor MOON, JUNEBAE, SEUL-KI
Owner SAMSUNG ELECTRONICS CO LTD
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